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Ebay - Buyer beware
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<blockquote data-quote="A_HRD" data-source="post: 37040" data-attributes="member: 49"><p>The UNC threads have a 60 degree flank angle as opposed to the BSW that have 55 degrees. Also, the crests and valleys of the threads are different, the BSW having more rounded radii. But the pitch (tpi) is the same (except 1/2"). </p><p></p><p>So, yes they are different; but UNC bolts will fit effortlessly into 60 year old worn crank cases, because the thread differences are only slight. This may wear your precious crankcase threads a little more as the bolts are tightened, but you pays your money and takes your choice. </p><p></p><p>Personally, I don't like to see allen headed screws on Vincents any more than I do modern carbs, alternators, etc. But everyone is entitled to their own preferences.....</p><p></p><p>Peter B</p><p>Bristol, UK</p></blockquote><p></p>
[QUOTE="A_HRD, post: 37040, member: 49"] The UNC threads have a 60 degree flank angle as opposed to the BSW that have 55 degrees. Also, the crests and valleys of the threads are different, the BSW having more rounded radii. But the pitch (tpi) is the same (except 1/2"). So, yes they are different; but UNC bolts will fit effortlessly into 60 year old worn crank cases, because the thread differences are only slight. This may wear your precious crankcase threads a little more as the bolts are tightened, but you pays your money and takes your choice. Personally, I don't like to see allen headed screws on Vincents any more than I do modern carbs, alternators, etc. But everyone is entitled to their own preferences..... Peter B Bristol, UK [/QUOTE]
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